PLEASE HELP CONCOLE SPAM

I was trying to use NBT Exploror and i choose one of my server worlds and i uninsalled it and now i get this concole spam

18:17:18 [SEVERE] net.minecraft.server.v1_5pre_R1.ExceptionWorldConflict: The sa
ve is being accessed from another location, aborting
18:17:18 [SEVERE] at net.minecraft.server.v1_5pre_R1.WorldNBTStorage.check
Session(WorldNBTStorage.java:68)
18:17:18 [SEVERE] at net.minecraft.server.v1_5pre_R1.World.E(World.java:25
86)
18:17:18 [SEVERE] at net.minecraft.server.v1_5pre_R1.WorldServer.a(WorldSe
rver.java:753)
18:17:18 [SEVERE] at net.minecraft.server.v1_5pre_R1.WorldServer.save(Worl
dServer.java:743)
18:17:18 [SEVERE] at net.minecraft.server.v1_5pre_R1.MinecraftServer.saveC
hunks(MinecraftServer.java:325)
18:17:18 [SEVERE] at net.minecraft.server.v1_5pre_R1.MinecraftServer.stop(
MinecraftServer.java:356)
18:17:18 [SEVERE] at net.minecraft.server.v1_5pre_R1.MinecraftServer.run(M
inecraftServer.java:448)
18:17:18 [SEVERE] at net.minecraft.server.v1_5pre_R1.ThreadServerApplicati
on.run(SourceFile:573)